112 ILLIXOIS BIOLOGICAL MONOGRAPHS [392 



EXPLANATION OF PLATE 



Alassostoma parvum 

 Fig. 66. Entire specimen, ventral view. X 27. 

 Fig. 67. Cross section of body posterior to the ovary showing coils of the 



excretory ducts. X 70. 

 Fig. 68. Cross section thru the posterior part of the acetabulum showing lymph 



spaces around the sucker. X 70. 

 Fig. 69. Cross section a short distance posterior to the genital pore showing in 



section, the uterus, the cirrus sac, and above the latter organ three 



loops of the seminal vesicle. X 70. 

 Fig. 70. Cross section of esophageal bulb with clusters of surrounding cells. X 70. 

 Fig. 71. Cross section of body thru the genital pore showing hermaphroditic duct, 



cirrus sac, lymph spaces and the character of the parenchyma. X 90. 



